I find scars to be nothing more than...skin; that IS all that it is, after all. Not a third arm, or gills, or stripes. Even if you were to have them, you can trick people into thinking you are actually one of the luckier ones to have such a rare mark. That's what I do with my "flaws"; I accentuate the fact that no one else has them, so they must be special (it's silly to think, but people will adore your courage and cunning for it)!